Membrane-based capacitive deionization (MCDI) is a novel method of desalination that promises to alleviate the stress of water shortage. Current techniques show limited efficiency in salt removal and experimental results suggest that an improvement in electrode materials could be the cornerstone of MCDI. In this study, bimetallic metal-organic frameworks (BMOFs) have been used as precursors to develop porous carbons for MCDI electrodes. BMOFs are a unique class of MOF that possess two types of metal ions with properties dependent on the ratio of the metal ions. In our work, we have synthesized a series of BMOFs with different molar ratios of Zn and Co based on ZIF-8 and ZIF-67. By controlling the molar ratio between Zn and Co, we are able to synthesized BMOF-derived porous carbons with different particle sizes and graphitization degrees. Furthermore, the porous carbon derived from a BMOF of Zn:Co = 3:1 exhibits a superior salt removal capacity of 45.62 mg g-1 in a 750 mg l-1 NaCl solution at 1.4 V. This performance was attributed to the large ion-accessible surface area and improved electrical conductivity of the carbon derived from BMOF.
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